Deleting the 11th row in RadGrid makes it empty

Question

I have one Telerik RadGrid. Using the method, I fill the grid. I turned on the paging property. I used ItemTemplate -> ImageButton to delete and edit parameters. I set the page size to 10. The page load time works correctly and fills the grid. After inserting the 11th row, pagination begins, and it will be displayed on the next page with one entry. But when I delete the 11th row, the grid becomes empty. I used a dataset to bind records.

radgrid.DataBind();
dsDataset.Dispose();

But its item.countequal to 0. What is the reason?

protected void Page_Load(object sender, EventArgs e)
{
    try
    {
        if (!IsPostBack)
        {
            PopulatePackage();
        }
    }
    catch (Exception ex)
    {
        lblMessage.Text = objUtl.GetErrorMessage(ex, this);
        lblMessage.Visible = true;

protected void gvPackage_NeedDataSource(object source, GridNeedDataSourceEventArgs e)
{
    try
    {
        SqlHelper objSQL = new SqlHelper();
        DataSet dsPackage = new DataSet();
        dsPackage = objSQL.ExecuteDataset("AL_PackageType_List_Retrieve", objUtl.NumericEntry(Session["LocationId"].ToString()));
        gvPackage.DataSource = dsPackage.Tables[0];
        dsPackage.Dispose();
        //PopulatePackage();
    }
    catch (Exception ex)
    {
        lblMessage.Text = objUtl.GetErrorMessage(ex, this);
        lblMessage.Visible = true;
    }
}

private void PopulatePackage()
{
    try
    {
        lblMessage.Text = string.Empty;
        SqlHelper objSQL = new SqlHelper();
        DataSet dsPackage = new DataSet();
        dsPackage = objSQL.ExecuteDataset("AL_PackageType_List_Retrieve", objUtl.NumericEntry(Session["LocationId"].ToString()));
        gvPackage.DataSource = null;
        gvPackage.DataSource = dsPackage.Tables[0];
        gvPackage.DataBind();
        //dsPackage.Dispose();
        if (gvPackage.Items.Count <= 0)
        {
            lblMessage.Text = "No Package Details Found...";
            gvPackage.Visible = false;
        }
        else
        {
            gvPackage.Visible = true;
        }
    }
    catch (Exception ex)
    {
        lblMessage.Text = objUtl.GetErrorMessage(ex, this);
        lblMessage.Visible = true;
    }
}

Answer 1

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RadGrid NeedDataSource. , RadGrid . , .

protected void Page_Load(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
        BindGrid();
    }
}

private void BindGrid()
{
    RadGrid1.DataSource = "BindingSource";
    RadGrid1.DataBind();
}

protected void RadGrid1_NeedDataSource(object sender, Telerik.Web.UI.GridNeedDataSourceEventArgs e)
{
    BindGrid();
}

, .